Shelving unit



FIG. 1 is a front perspective view of a shelf embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view taken from the left of FIG. 1; and

FIG. 4 is a front elevational view thereof, the rear being flat and unornamented. 

The ornamental design for a shelving unit, substantially as shown and described. 